[Objective] Comparing the water-holding capacity of litters in six different bamboo forests mixed with Casuarina equisetifolia is of great importance to tree species selection in coastal protection forest.[Methods] By setting the standard plots, samples collection and laboratory immersion experiment, original water-holding rate, water-absorbing characteristic and the water-losing characteristic of litters in 6 mixed forest were measured to compare the water-holding capacity of litters in six different coastal protection mixed forests.[Results] The forest with maximum water-holding rate was Dendrocalamus minor var. amoenus, followed by the Dendrocalamopsis vario-striata, Dendrocalamus brandisii, Bambusa oldhami, Dendrocalamus latiflorus, Bambusa beecheyana var. pubescens. while the forest with higher original water content is D. brandisii, followed by D. minor var.amoenus, B. oldhami, B. beecheyana var.pubescens, D. vario-striata, D. latiflorus. In absorbing and natural drying process, water-holding rate, water-absorbing speed, water-losing rate and water-losing speed of all kinds of litters in mix forest increased rapidly in the first two hours. From then on, the rates slowed down with prolonged immersion time, and gradually became stabilized after 16 hours.[Conclusion] Water-holding rate and water-losing rate of litters increased following a log function with the time immersed in water, and the water-absorbing speed rate and water-losing speed followed a power function